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03-19-2010
So there's a loud creaking noise coming from the car whenever I...shift into reverse, shift into drive, or begin accelerating, and occasionally when I have to stop abruptly. Also is all this rocking normal? The video shows the sound and the rocking, I got one from under the car, forgot to get one of the engine but you get the idea. The sound sounds like it coming from the dogbones.
http://www.youtube.com/watch?v=Om712AutEPs
03-19-2010
It says the vid wasn't processed yet. Should be up soon.
03-19-2010
Looks like your mounts are EPICALLY shot
03-19-2010
^I agree. A lot of movement there.
03-19-2010
Yep time for some mounts.
03-19-2010
lol dude, you needed new motor mounts months ago. Still didn't get them done yet?!?Originally Posted by BwolfGT
03-19-2010
Motor mounts, (in case you didnt belive them^^ )
03-19-2010
Motor AND trans mounts are BRAND NEW. Well, like 5k miles old.
03-19-2010
if the mounts are new, then i got nothing.
the mounts are all tight and not moving?
03-19-2010
did you remember to put the nuts on? lol, it should not move that much
03-19-2010
As far as I know, yes.
03-20-2010
Might want to check to see if you put them on the right way...because if not...the nuts will only tighten down maybe a thread or two
03-20-2010
Check the sub frame bolts?
03-20-2010
Nice video, my guess is the power is moving to the next weak point - which is prolly the stock cradle mounts, that is the primary suspect on mine now that ive replaced the motor mounts (today) - ive never taken the cradle off so ill i really dont know that much about it, nor have i attempted any maintenance to the links at all but its what ties the motor trans suspension and everything to the car, so far as i can tell all the bushings for it on mine are rubber, also for the 04+ cars there are some sections of this that are different for w/ sport suspension vs standard when browsing through the gm parts direct site for an 04-08 grand prix
Under front suspension - suspension mounting - upper insulator front or rear
I dunno if there is enough play in the cradle on your video to explain the rocking, i could see it moving some but not that much, is it possible the radiator support is flexing since you're putting it in gear and giving it no other option?
Edit: also if the sub frame is playing it will do it more actually driving rather than being on a lift with the brake held, since you are currently containing the pressure internally to the car, the torque from the trans is applied to the wheels then to the strut tower and back to the cradle. Compared to being on the ground in drive where it will try to move the entire assembly in the direction you are accelerating, while bringing the rest of the car along for the ride.
Last edited by GeeBee; 03-20-2010 at 12:28 AM. Reason: More theorys popped into head
03-20-2010
mine are toast and are not even that bad
hogan 3inch DP u bend delete ,180*tstat, autolite 104s, LED interior, 4" FWI, 2000watt system, bullitt rims, zzp pistons, pems, alt rewire, thrush muffs, 3.4 zzp mps, transgo shift kit, triple edge performance trans. autometer triple pod :SOON: urlosn HPT PCM tune, HEADERS, 1.9's
03-29-2010
Bump. I've had like 5 people look at this with me and nobody can figure it out. Help? Should I replace the motor mounts again and see what happens?? ALSO, the engine seems very out of alignment, when we disconnected the front mounts to do sparks the other day when we went to put em back on we noticed the engine was offset to the left, and not just a little but either. It was a ***** to get the mounts back on like that but we did it (eventually).
03-29-2010
what makes me wonder is why is your motor ideling so high. it shouldnt drop that much when you put it in gear. what rpm's you runnin in park/neutral.
03-29-2010
replace the motor mounts prolly the passenger lower one thats bad
03-29-2010
Would make sense because that's the direction the engine is offset too, but the mounts are new and just checked yesterday bolts are tight.
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